many of us have grown up mugging this and I always wondered what is this ZA, is it a synonym of "equals to" ??

Just a casual browsing today answered this long pending query of mine

its actually

two 1s are twotwo 2s are fourtwo 3s are six

Thanks to the anonymous who clarified this thing to me today.

If we divide the whole table in columns, I always thought that its the "1st column" being counted "2nd column" times gives you the result in "3rd column". Its actually the "2nd column" counted "1st column" time gives you the result in "3rd column".